[nicollo]

Reminds of:

http://www.waterhistory.org/histories/qanats/

[SunkenCiv]

Y'know, that would make a great standalone topic (or for that matter, maybe it already has, and I've missed it, or more likely forgotten about it). Regardless, very good catch, I'm corroded with jealousy that I didn't think of it. :^)

[SunkenCiv]

• Aboriginal People Built Water Tunnels [2006]
• Nasca Lines may be giant map of underground water sources [2010]
• The Ancient Peruvian Mystery Solved From Space [Nazca puquios] [2016]